Object doesn't support property or method 'get_item'

Question

When i try with this code i got error Object doesn't support property or method 'get_item' . Please help me to resolve

function showTitles(urlColumnName) {
    var selectedItemIds = getSelectedItemIds();
    for (var ii = 0; ii < selectedItemIds.length; ii++) {
        var context = new SP.ClientContext.get_current();
        var web = context.get_web();
        var lists = web.get_lists();
        var list = lists.getById(SP.ListOperation.Selection.getSelectedList());
        var item = list.getItemById(ii);

        context.load(item, "Title");
        context.executeQueryAsync(Function.createDelegate(this, getAndShowTitle(item, urlColumnName)),
            Function.createDelegate(this, showError));
    }
}

function getAndShowTitle(item, urlColumnName) {
    var title = item.get_item("Title");
    alert(title);
}


function showError(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

Answer 1

I have not tested your code, but i think,

Try with

getAndShowTitle(sender, args)

also, remove arguments form executeQueryAsync of executeQueryAsync method.

You don't need to pass item in argument, if you load item you will get that item in succeed method.

Check for ref: http://msdn.microsoft.com/en-us/library/hh185007.aspx

Answer 2

There are some errors in your javascript code. The error you pointed is solved by Vardhaman Deshpande by declaring a global variable "selectedItem" and by shahjinesh11 (the argument is not item, but "sender").

But there are some other improvements you can do:

• variable ii in the for-loop is just an index, not the id of the selected items
• don't create context, current list inside the for-loop, it can be instantiated outside the for-loop.
• "new" is useless in "SP.ClientContext.get_current()"
• you can't write arguments in the delegate getAndShowTitle: Function.createDelegate(this, getAndShowTitle(item, urlColumnName)
• To avoid global variables like "selectedItem", use anonymous functions like in my code example.

This code is similar to the code I pasted in my another answer: Read selected item from List

//list
var listGuid = SP.ListOperation.Selection.getSelectedList();
var ctx = SP.ClientContext.get_current();
var web = ctx.get_web();
var lists = web.get_lists();
var list = lists.getById(listGuid);

//selected items
var selectedItems = SP.ListOperation.Selection.getSelectedItems();
var items = [];
for(var i = 0; i < selectedItems.length; i++) {
    var id = selectedItems[i].id;
    var item = list.getItemById(id);
    items.push(item);
    ctx.load(item, "Title");
}
if (items) {
    ctx.executeQueryAsync(function() {
        //just alert for testing
        var titles = "Titles of the selected items:\n";
        for(var j = 0; j < items.length; j++) {
            titles += items[j].get_item("Title") + "\n";
        }
        alert(titles);
    }, function(sender, args){
        alert('Request failed. ' 
            + args.get_message() + '\n' 
            + args.get_stackTrace());
    });
}

Answer 3

Try this:

var selectedItem;

function showTitles(urlColumnName) {
    var selectedItemIds = getSelectedItemIds();
    for (var ii = 1; ii < selectedItemIds.length; ii++) {
        var context = new SP.ClientContext.get_current();
        var web = context.get_web();
        var lists = web.get_lists();
        var list = lists.getById(SP.ListOperation.Selection.getSelectedList());
        selectedItem = list.getItemById(ii);

        context.load(item, "Title");
        context.executeQueryAsync(Function.createDelegate(this, getAndShowTitle),
            Function.createDelegate(this, showError));
    }
}

function getAndShowTitle(sender, args) {
    var title = selectedItem.get_item("Title");
    alert(title);
}


function showError(sender, args) {
    alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}

The Success callback of executeQueryAsync method cannot be passed arguments. There are 2 default arguments which are passed to it but neither of them is the item you want. So you will have to declare the item variable outside so that both your showTitles and getAndShowTitle functions can access it.

But be aware that since the executeQueryAsync is asynchronous call, your for loop and the callbacks will run in parallel and not synchronously.